Unicompartmental knee replacement also known as uni-knee or half-knee replacement , is done when predominantly one of the three compartments of the knee is arthritic. The worn surfaces of one side (compartment) of the thigh bone and leg bone at the knee joint are resurfaced.

It is a smaller procedure in terms of surgical cut required, blood loss and recovery when compared to total knee replacement. The patient stays in the hospital for 5-7 days and is able to walk the next day after the surgery with the help of support. The patient can visit the wash-room on the second or third day.